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Tropical Storm Gabrielle Forecast Discussion Number 21
2019-09-08 16:52:37| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Sun Sep 08 2019 000 WTNT43 KNHC 081452 TCDAT3 Tropical Storm Gabrielle Discussion Number 21 NWS National Hurricane Center Miami FL AL082019 1100 AM AST Sun Sep 08 2019 Gabrielle continues to show signs of becoming better organized. Deep convection now wraps about two-thirds of the way around the center of circulation, and microwave imagery shows a distinct curved band on the western semicircle. A blend of the various satellite intensity estimates support holding the initial intensity at 50 kt. However, this value may be a little conservative. The tropical storm will continue to be in a moderately favorable environment for intensification over the next 24 hours or so. And, based on the improving presentation of Gabrielle since late last night, some intensification seems likely during that time. After 24 to 36 hours, increasing southwesterly shear will begin to impact the cyclone as a mid-latitude trough approaches the region, and the system will move over cooler waters. This should cause a gradual weakening trend to begin. After 48 hours, Gabrielle is expected to merge with a cold front and become an extratropical cyclone. The official forecast intensity has been increased slightly through 36 hours out of respect for the near term likelihood for intensification. Otherwise, the forecast is similar to the previous one, and is in agreement with the various consensus aids. The initial motion is 330/10kt. Gabrielle will turn to the north later today and then northeast by Monday as the system rounds the western periphery of a mid-level ridge centered near the Azores. Once Gabrielle turns northeastward, it will become embedded in the increasing southwesterly flow ahead of the approaching mid-latitude trough, which will accelerate the cyclone's forward motion. The official forecast is little changed from the previous one, and is near the tightly clustered track guidance. FORECAST POSITIONS AND MAX WINDS INIT 08/1500Z 33.8N 49.0W 50 KT 60 MPH 12H 09/0000Z 35.6N 49.1W 60 KT 70 MPH 24H 09/1200Z 38.4N 47.5W 60 KT 70 MPH 36H 10/0000Z 41.2N 43.8W 60 KT 70 MPH 48H 10/1200Z 43.7N 39.0W 55 KT 65 MPH 72H 11/1200Z 50.1N 24.7W 45 KT 50 MPH...POST-TROP/EXTRATROP 96H 12/1200Z 57.8N 5.3W 35 KT 40 MPH...POST-TROP/EXTRATROP 120H 13/1200Z...DISSIPATED $$ Forecaster Latto
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